Don’t update to 4.2, but if you are already on 4.2, Softmod for any 4.2 written by Shadowsonic2

2009 Wii Serial numbers after LU3884XXXX and LEH2676XXXX have probably got the new D3-2 chip that prevents playing backup DVD's. They can still use original discs and USB loaders.
Check yours at Wii Drive Chip Database

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I hope you have a great time here at WiiHacks, and increase your knowledge of all things Wii.